Qualcomm Technologies, Inc. mdss-spi-client

mdss-spi-client is for spi display send the FB data to spi master.

Required properties:
- compatible : should be "qcom,mdss-spi-client"
- spi-max-frequency : Maximum SPI clocking speed of device in Hz

Optional properties:
- label: A string used to describe the controller used.
- spi-cpol : Empty property indicating device requires inverse
  clock polarity (CPOL) mode
- spi-cpha :  Empty property indicating device requires shifted
  clock phase (CPHA) mode
- spi-cs-high :  Empty property indicating device requires
  chip select active high

Example:
spi@78b9000 { /* BLSP1 QUP5 */
               qcom,mdss_spi_client{
               reg = <0>;
               compatible = "qcom,mdss-spi-client";
               label = "MDSS SPI QUP5 CLIENT";
               spi-max-frequency = <50000000>;
               };
};
